Sigh. So much ignorance, so little time. ad hominem is a fallacy of irrelevance. The truth or falsity of an irrelevant statement is, well, irrelevant.
How is it irrelevant that Darwin was biased towards atheism irrelevant to the truth of or falsity of evolution? Evolutionists constantly claim that their opponents are biased. You even call people who oppose evolution liars for Christ. Bias is certainly relevant especially since the Darwinist philosophy is very atheistic.